Abstract: The steam generator includes: a water supply channel for supplying a secondary coolant to a tube bundle outer casing with the secondary coolant being isolated from the recirculating secondary coolant; a recirculating secondary coolant injection section for injecting the recirculating secondary coolant toward a high temperature-side heat transfer tube bundle; and a supplied secondary coolant injection section for injecting the secondary coolant supplied from the water supply channel toward a low temperature-side heat transfer tube bundle. The recirculating secondary coolant injection section and the supplied secondary coolant injection section being disposed in the tube bundle outer casing on the side toward the tube plate. The recirculating secondary coolant injection section and the supplied secondary coolant injection section are defined such that, of the secondary coolant and the recirculating secondary coolant, the coolant having a higher relative flow rate than the other flows at a lower velocity.

Abstract: A heat exchanger tube vibration suppression device and a steam generator are provided. The heat exchanger tube vibration suppression device includes: a plurality of sleeves disposed in a heat exchanger tube with a predetermined gap in relation to an inner surface of the heat exchanger tube so as to extend in a longitudinal direction of the heat exchanger tube; and a connecting member that connects the plurality of sleeves so as to be movable between a contracted position at which adjacent sleeves overlap at least partially and an extended position at which the amount of overlap of the adjacent sleeves is minimized. In this way, it is possible to suppress the vibration of the heat exchanger tube appropriately.

Abstract: A steam generator having a heat transfer tube group formed of a plurality of U-shaped heat transfer tubes; an annular channel formed to cover the circumference of the heat transfer tube group; the annular channel having an opening that communicates with the heat transfer tube group; a water supply unit disposed at an upper portion of the annular channel and supplies water to a descending-side portion; a steam/water separator disposed above the heat transfer tube group; and an air bubble removing member for removing air bubbles provided in the annular channel.

Abstract: In a multi-stage steam-water separation device and a steam-water separator, a first swirl vane (6) which causes a gas-liquid two-phase flow to rise while swirling is provided in a first riser (5) of a first steam-water separator (2), and a second swirl vane (12) which causes the gas-liquid two-phase flow which has passed through the first swirl vane (6) to rise while swirling at a speed higher than that provided by the first swirl vane (6), is provided in a second riser (11).

Abstract: A heat transfer tube repairing apparatus including a wire that is flexible and is insertable into a heat transfer tube, a sleeve that is fixed to a predetermined position in the longitudinal direction of the wire, a pair of pressing members that is provided at the front and rear sides of the sleeve in the longitudinal direction of the wire and is able to press the inner surface of the heat transfer tube, and operation members that are able to move the pressing members between a pressing position where the pressing members press the inner surface of the heat transfer tube and a separating position where the pressing members are separated from the inner surface of the heat transfer tube.

Abstract: An in-plane compressive strength evaluation device (10) provided with a memory unit (21) into which, when an in-plane compressive strength evaluation is actually performed using a test piece, an evaluation result is stored as first information; a first analysis unit (22) that obtains second information that is an evaluation result related to the load and a displacement of the structural model; an adjustment unit (23) that adjusts an elemental factor of the structural model that influences the in-plane compressive strength such that the second information approaches the first information; and a second analysis unit (24) that, in a state where the elemental factor used when the second information approaches the first information most closely expands the structural model into the structural form of the actual tube support plate, and that performs the in-plane compressive strength evaluation using the expanded structural model.

Abstract: The steam generator includes: a water supply channel for supplying a secondary coolant to a tube bundle outer casing with the secondary coolant being isolated from the recirculating secondary coolant; a recirculating secondary coolant injection section for injecting the recirculating secondary coolant toward a high temperature-side heat transfer tube bundle; and a supplied secondary coolant injection section for injecting the secondary coolant supplied from the water supply channel toward a low temperature-side heat transfer tube bundle. The recirculating secondary coolant injection section and the supplied secondary coolant injection section being disposed in the tube bundle outer casing on the side toward the tube plate. The recirculating secondary coolant injection section and the supplied secondary coolant injection section are defined such that, of the secondary coolant and the recirculating secondary coolant, the coolant having a higher relative flow rate than the other flows at a lower velocity.

Abstract: In a multi-stage steam-water separation device and a steam-water separator, a first swirl vane (6) which causes a gas-liquid two-phase flow to rise while swirling is provided in a first riser (5) of a first steam-water separator (2), and a second swirl vane (12) which causes the gas-liquid two-phase flow which has passed through the first swirl vane (6) to rise while swirling at a speed higher than that provided by the first swirl vane (6), is provided in a second riser (11).

Abstract: In a dissimilar material joint structure that joins together an anti vibration bar (first member) 14 and a end cap (second member) 15, which is a dissimilar metal material to the anti vibration bar 14, the anti vibration bar 14 is sandwiched by a plurality of end caps (second members) 151 and 152, and these respective end caps 151 and 152 are joined together by welding. Due to contraction of a weld material 153 welding the end caps 151 and 152, the anti vibration bar 14 is sandwiched between the end caps 151 and 152, whereby the anti vibration bar 14 and the end cap 15 are joined. Consequently, a thermal treatment for welding dissimilar metal materials is not required, and the welding operation can be carried out easily.

Abstract: A reduction in cost and improvement in evaluation accuracy are achieved.

Abstract: In a steam-water separator, horizontal slits are formed on the outer side of the curving direction of the curved part and at a location between the curved part of the riser and the swirl vane.

Abstract: A steam generator is provided in which the total heat transfer efficiency can be improved by suppressing a reduction in the amount of heat exchange at an inlet side of heat transfer tubes while maintaining the effect of increasing the amount of heat exchange at an outlet side thereof.

Abstract: The present invention aims to decrease a pressure loss in a tube support plate 200 disposed in a steam generator, and ensure sufficient strength. The tube support plate 200 has many through-holes 100 formed therein for passage of heat transfer tubes 210. The shape of the through-hole 100 is a hexagonal shape. Protrusions 100a, 100b, 100c are formed in alternate sides 102, 104, 106 among the sides constituting the hexagonal shape. The arrangement of the through-holes 100 is a so-called honeycomb arrangement. Thus, the opening area of the through-hole 100 can be rendered large to decrease a pressure loss, and the strength of the tube support plate can be ensured.

Abstract: In a steam-water separator, horizontal slits are formed on the outer side of the curving direction of the curved part and at a location between the curved part of the riser and the swirl vane.